chert

常见例句

Thus we can better understand the deformation of chert in a highly fluid form.
这样我们就能更好地理解燧石在高度流体状态时的变形情况。
The Anasazi made arrowheads by chipping away at pieces of glassy obsidian (black) and chert (grey and red) until they became sharp.
古阿纳萨齐人通过细细地打磨黑曜石和黑硅石使它们变的锋利，最后制作出箭头来。
The Middle Permian Chihsia Formation of South China is featured by nodular chert, which is of implications in the reconstruction of coeval paleogeography and paleoceanography.
燧石结核是华南地区二叠纪栖霞组的重要识别特征之一，其成因具重要的古地理、古海洋意义。
dictall.com

When he shone a light up through it, he could see fine-grained particles of silica, known as chert, mixed in with what looked like coal.
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